... It is the future, prices are declining.
The Radions are REALLY nice, but expensive... I'd like to get those eventually, but am running something similar to the TaoTronics you can get on eBay. Much more affordable, but still plenty powerful to light 20" deep water (approx).
I haven't got any corals under them, but a Carpet Anemone is doing VERY well... Has made itself a home between a couple rocks at about 16" of depth under those LED
An advantage to LED
's is that they don't loose intensity as they age... as long as they light up, they put out the same amount of light as when new... They are also pretty robust, but eventually, individual LEDs will fail, and depending on how your fixture is put together, you may or may not be able to easily replace individual LEDs.
That is part of why the Radion units are worth their price... Groups of LEDs are easily replaceable... either for failures, or for newer technology, or to change color output.